.content header { height: 213px; }
nav a:nth-child(1) i.iconfont { color: #f60; }
nav a:nth-child(2) i.iconfont { color: #369; }
nav a:nth-child(3) i.iconfont { color: #f66; }
nav a:nth-child(4) i.iconfont { color: #9c3; }
nav { padding: 30px 0 }
nav a { width: 25%; display: inline-block; float: left; text-align: center; color: #999;}
nav a i.iconfont { font-size: 80px; }
nav span { display: block; font-size: 12px; }
.content .indexlist{ margin-top:4%}
.content .indexlist img{  border:1px solid #e0e0e0; padding:0.5%;}